tidal

submissive to the motions of the moon
tides bow and scrape retreating from the sand
but stand up tall when sun stands at the noon
each wave dividing heaven's clock's sweep-hand
as interfering curves add and subtract
the waters mount to Spring, now lull to Neap
and endless dance of retreat and attack
now spread about, now gathered in a heap
the angular momentum of the Earth
might yet replace the coal we oughtn't burn
but going Green need not mean cold, and dearth
the options are at hand, if we'd but learn.
Hooked to the grid, such power could be canned
that's now employed redistributing sand